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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        let a = new Promise((resolve, reject) => {
            // resolve()
            // reject()
        })
        console.log(a)

        // 定义类
        class MyPromise {
            constructor(handle) {
                this['[[PromiseState]]'] = 'pending'
                this['[[PromiseResult]]'] = undefined
                handle(this._resolve.bind(this), this._reject.bind(this))
            }
            _resolve(val) {
                this['[[PromiseState]]'] = 'fulfilled'
                this['[[PromiseResult]]'] = val
            }
            _reject(err) {
                this['[[PromiseStatu]]'] = 'rejected'
                this['[[PromiseResult]]'] = err
            }
        }
        let p = new MyPromise((resolve, reject) => {
            // resolve()
            reject()
        })

        console.log(p)




    </script>
</body>
</html>